Cap

ABSTRACT

A cap includes a cap includes a cap body including a disk-shaped top plate portion and a cylindrical skirt portion provided at a peripheral edge portion of the top plate portion; a sealing member provided separately from the cap body in the cap body so as to face the top plate portion, the sealing member having an outer diameter smaller than an inner diameter of the skirt portion; a bead portion provided in the skirt portion, restricting movement of the sealing member in a direction away from the top plate portion, supporting the sealing member, and protruding annularly inward in a radial direction of the skirt portion; and a slit portion provided in the bead portion.

CROSS-REFERENCE TO RELATED APPLICATIONS

This is a Continuation Application of PCT application No. PCT/JP2019/035338, filed Sep. 9, 2019, which was published under PCT Article 21(2) in Japanese.

This application is based upon and claims the benefit of priority from Japanese Patent Application No. 2018-169580, filed Sep. 11, 2018, the entire contents of which are incorporated herein by reference.

FIELD

The present invention relates generally to a cap for closing a can container.

BACKGROUND

Conventionally, a cap for sealing a mouth portion of a can container has a configuration in which a sealing member made of a resin material that is in close contact with the mouth portion is provided on an inner surface of a cap body. Jpn. Pat. Appln. KOKAI Publication No. 2017-178421 discloses a technique in which a cap body and a sealing member are not bonded to each other in order to reduce opening torque when the cap is opened. As described above, in a case where the sealing member is not bonded, a locking protrusion protruding inward is formed on a skirt portion of the cap body to lock the sealing member so that the sealing member does not fall off.

Furthermore, in a case where a cap is used for a positive pressure can having a positive internal pressure, a technique is known in which a vent slit is formed in the cap in order to release the internal pressure when the cap is opened.

SUMMARY

However, in a case where the vent slit is provided in the cap, a tactile sensation when opening the cap may be reduced, such as a cut end portion of the vent slit Causing a sense of discomfort in the hand when opening the cap. In addition, there is a concern that the contents may scatter from the vent slit together with the gas in the can when opening the cap. Therefore, a technique for suppressing the scattering of the contents from the vent slit is required.

Therefore, an object of the present invention is to provide a cap capable of improving a tactile sensation when opening the cap and suppressing scattering of contents.

According to the present invention, it is possible to provide a cap capable of improving a tactile sensation when opening the cap and suppressing scattering of contents.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a side view showing a configuration of a cap according to a first embodiment of the present invention in a partial cross section.

FIG. 2 is a side view showing the configuration of the cap.

FIG. 3 is a cross-sectional view showing the configuration of the cap with a part thereof omitted.

FIG. 4 is a cross-sectional view showing a configuration of a main part of the cap.

FIG. 5 is a cross-sectional view showing a configuration of a cap body of the cap.

FIG. 6 is a cross-sectional view showing a configuration of the cap body.

DETAILED DESCRIPTION

According to one aspect of the present invention, a cap includes a cap body including a disk-shaped top plate portion and a cylindrical skirt portion provided at a peripheral edge portion of the top plate portion; a sealing member provided separately from the cap body in the cap body so as to face the top plate portion, the sealing member having an outer diameter smaller than an inner diameter of the skirt portion; a bead portion provided in the skirt portion, restricting movement of the sealing member in a direction away from the top plate portion, supporting the sealing member, and protruding annularly inward in a radial direction of the skirt portion; and a slit portion provided in the bead portion.

Hereinafter, a cap 1 according to an embodiment of the present invention will be explained with reference to FIG. 1 to FIG. 6.

FIG. 1 is a side view showing a configuration of cap 1 according to a first embodiment of the present invention in a partial cross section. FIG. 2 is a side view showing the configuration of the cap 1. FIG. 3 is a cross-sectional view showing the configuration of the cap 1 with a part thereof omitted. FIG. 4 is a cross-sectional view showing a configuration of a main part of the cap 1 and movement of gas in a can container 100 when the cap 1 is separated from a mouth portion 110 of the can container 100. FIG. 5 is a cross-sectional view showing a configuration of a cap body 11 used in the cap 1, taken along a cross section of line V-V in FIG. 2. FIG. 6 is a cross-sectional view showing a configuration of a bead portion 32 and a slit portion 33 of the cap body 11, taken along a cross section of line VI-VI in FIG. 2, with other configurations partially omitted.

As shown in FIG. 1, the cap 1 is attached to the mouth portion 110 of the can container 100, and is wound and compacted in a state of being placed on the mouth portion 110 of the can container 100, thereby sealing the can container 100.

Here, the can container 100 is a so-called bottle-shaped container that contains a beverage or the like. For example, the can container 100 is made of a metal material such as an aluminum alloy or a surface-treated steel plate having resin films laminated on both surfaces thereof. The can container 100 is formed in a cylindrical shape having a different outer diameter, with one end reduced in diameter. The can container 100 has the mouth portion 110 at one end for discharging the contained beverage. The mouth portion 110 has a law portion 111, a male screw portion 112, and a curled portion 113 on the outer peripheral surface thereof from the bottom surface side of the can container 100 toward the end portion.

The jaw portion 111 is configured to protrude annularly. The curled portion 113 is formed to have a smaller diameter than the male screw portion 112. The outer diameter of the curled portion 113 is smaller than the inner diameter of the cap 1. The curled portion 113 is formed by folding the end portion of the mouth portion 110 once or more. The curled portion 113 forms an opening through which the beverage contained in the can 100 is discharged.

As shown in FIG. 1 to FIG. 4, the cap 1 includes the cap body 11 and a sealing member 12 provided separately in the cap body 11.

The cap body 11 is formed of a material obtained by forming a resin coating layer on a metal material such as an aluminum alloy. The cap body 11 is formed by performing each molding such as drawing, knurling, and roll-on molding of a thin plate-shaped material into a cup shape.

The cap body 11 includes a disk-shaped top plate portion 21 and a cylindrical skirt portion 22 provided integrally with a peripheral edge portion of the top plate portion 21. In the cap body 11, the top plate portion 21 and the skirt portion 22 are integrally and continuously configured by an annular and curved corner portion 23.

The top plate portion 21 has a disk shape and has a flat main surface. One end of the skirt portion. 22 is continuous with the top plate portion 21 via the corner portion 23, and the other end is open. The skirt portion 22 includes a plurality of recessed portions 31, a bead portion 32, a plurality of slit portions 33, a female screw portion 34, and a tamper evidence band portion 35 between an end portion on the top plate portion 21 side and an opened distal end portion.

As shown in FIG. 1 to FIG. 6, the plurality of recessed portions 31, the bead portion 32, the plurality of slit portions 33, the female screw portion 34, and the tamper evidence band portion 35 are formed by performing processing, such as knurling or roll-on molding, on a cup-shaped molded product including the top plate portion 21, the cylindrical skirt portion 22 on which the plurality of recessed portions 31, the bead portion 32, the plurality of slit portions 33, the female screw portion 34, and the tamper evidence band portion 35 are not formed, and the corner portion 23.

As shown in FIG. 1, FIG. 2, and FIG. 5, the plurality of recessed portions 31 are provided between the top plate portion 21 and the bead portion 32 of the skirt portion 22. For example, the plurality of recessed portions 31 are arranged at equal intervals in the circumferential direction of the skirt portion 22. The plurality of recessed portions 31 are formed so that the dimension in the axial direction of the cap 1 is longer than the dimension in the circumferential direction of the cap 1.

As shown in FIG. 1, FIG. 2, FIG. 4, and FIG. 6, the bead portion 32 is formed in an annular shape. The bead portion is configured in a manner Such that the skirt portion 22 annularly protrudes 7 ward in the radial direction on the distal end side of the skirt portion 22 with respect to the plurality of recessed portions 31. The inner diameter of the bead portion 32 is smaller than the outer diameter of the sealing member 12. Therefore, the bead portion 32 configures a locking portion that restricts movement of the sealing member 12 disposed on the top plate portion 21 in a direction away from the top plate portion 21. Specifically, as shown in FIG. 1; FIG. 3, and FIG. 4, a portion of the bead portion 32 having the smallest inner diameter is set to be smaller than the outer diameter of the sealing member 12, and is inclined with respect to the axis of the skirt portion 22 from such a portion to the skirt portion 22.

As shown in FIG. 1, FIG. 2, FIG. 4, and FIG. 6, the plurality of slit portions 33 are provided in the bead portion 32. The plurality of slit portions 33 are arranged at equal intervals along the circumferential direction of the bead portion 32. For example, the slit portions 33 are provided at eight locations in the bead portion 32 at equal intervals in the circumferential direction. The slit portion 33 is configured by a cut provided in a part of the bead portion 32. The slit portion 33 releases the internal pressure of the sealed can container 100 when the cap 1 is removed from the can container 100.

As shown in FIG. 1, FIG. 3, and FIG. 4, the slit portion 33 is provided at a portion closer to the distal end side of the skirt portion 22 than a portion of the bead portion 32 which is the innermost peripheral portion in the radial direction. In other words, the slit portion 33 is provided on the distal end side of the skirt portion. 22 with respect to a portion where the inner diameter of the bead portion 32 is the smallest. The slit portion 33 is formed by a cut provided in a part of the bead portion 32 and extending in the circumferential direction. Therefore, as shown in FIG. 1, FIG. 3, and FIG. 4, the slit portion 33 has a first end portion 33 a on the p plate portion 21 side and a second end portion 33 b on the distal end side of the skirt portion 22.

The first end portion 33 a and the second end portion 33 b of the slit portion 33 are formed by portions of the bead portion 32. The first end portion 33 a extends radially inward from the top plate portion 21 side toward the distal end side of the skirt portion 22. In other words, as shown in FIG. 4, when the can container 100 is set downward and the cap 1 is set upward in a state where the cap 1 is placed on the mouth portion 110 of the can container 100, the first end portion 33 a extends inward and downward of the cap 1.

Furthermore, for example, as shown in FIG. 4, the distal end of the first end portion 33 a bends toward the axial direction of the cap 1 and extends toward the distal end of the cap 1 in the axial direction of the cap 1. Here, the expression “the distal end of the first end portion 33 a extends toward the distal end of the cap 1 in the axial direction” does not mean that the extension of the first end portion 33 a needs to be a predetermined length; however, it may mean that the distal end of the first end portion 33 a is directed in the axial direction by bending a part of the first end portion 33 a so that the distal end thereof is directed in the axial direction.

The second end portion 33 b extends radially inward from the distal end side of the skirt portion 22 toward the top plate portion 21, In other words, as shown in FIG. 4, when the can container 100 is set downward and the cap 1 is set upward in a state where the cap 1 is placed on the mouth portion 110 of the can container 100, the second end portion 33 b extends inward and upward of the cap 1.

As shown in FIG. 4, the distal end of the first end portion 33 a of the slit portion 33 is located inward of the distal end of the second end portion 33 b in the radial direction of the skirt portion 22. That is, in the slit portion 33, the distal end of the first end portion 33 a is closer to the center of the skirt portion 22 than the distal end of the second end portion 33 b.

The female screw portion 34 is configured to be screwed with the male screw portion 112 of the can container 100. The female screw portion 34 is molded together with the can container 100. That is, the female screw portion 34 is not molded in the cap 1 before attachment to the can container 100; however, it is molded when being integrally combined with the can container 100.

As shown in FIG. 1 and FIG. 2, the tamper evidence band portion 35 engages with the jaw portion 111 of the cap container 100 in a direction in which the cap 1 moves away from the can container 100 and in an axial direction of the cap 1. Furthermore, the tamper evidence band portion 35 has a breaking portion 35 a which is broken when the cap 1 is opened and is detached from the skirt portion 22. That is, the tamper evidence band portion 35 is configured by forming a slit on the end portion side of the skirt portion 22 while leaving the breaking portion 35 a, and is shaped into the shape of the jaw portion 111 of the can container 100 when it is integrally combined with the can container 100, thereby engaging with the jaw portion 111, in a manner similar to the female screw portion 34.

As shown in FIG. 3, the sealing member 12 is formed separately from the cap body 11. That is, the sealing member 12 is disposed to face the top plate portion 21 and the skirt portion 22, and is not bonded to the cap 1. Specifically, as shown in FIG. 1, FIG. 3, and FIG. 4, the sealing member 12 is formed in a disk shape and has an outer diameter set to be larger than an inner diameter of the bead portion 32 provided in the skirt portion 2L of the cap body 11. Furthermore, the outer diameter of the sealing Member 12 is set to be equal to or slightly smaller than the diameter of a circle tangent to the inner surfaces of the plurality of recessed portions 31 provided in the skirt portion 22 of the cap body 11.

The sealing member 12 is prevented from falling off from the cap body 11 in the axial direction by engaging with the bead portion 32 protruding in the radial direction from the inner peripheral surface of the skirt portion 22 in the axial direction of the cap body 11, and is integrally provided with the cap body 11, Furthermore, the sealing member 12 is brought into contact with the inner surfaces of the plurality of recessed portions 31 of the skirt portion 22 to be engaged with the cap body 11 in the radial direction, whereby the sealing Member 12 is centered so that the center thereof is positioned in a predetermined range on the axis of the cap body 11.

The sealing member 12 includes a disk-shaped sliding layer 41 and a disk-shaped sealing layer 42 integrally laminated on the sliding layer 41. The sealing member 12 is configured by integrally molding the sliding layer 41 and the sealing layer 42 with different resin materials. The sealing member 12 includes, for example, a flat plate portion 12 a that is uniformly thick and a curved surface portion 12 b in which an outer surface of an outer peripheral edge on the top plate portion 21 side is formed of a curved surface. In other words, the sealing member 12 is formed in a disk shape, and the ridge portion on the top plate portion 21 side is configured by a curved surface having a predetermined curvature. Furthermore, in the sealing member 12, the curved surface portion 12 b forming the outer peripheral edge side is configured to be thinner than the flat plate portion 12 a, the curved surface portion 12 b is configured to be gradually thinner from the center side toward the outer peripheral edge, and the distal end of the curved surface portion 12 b, that is, the outer peripheral edge, is configured to be thinnest among other portions. The flat plate portion 12 a configures a sealing portion in which a part of the curved surface portion 12 b side comes into contact with the mouth portion 110 of the can container 100. In the flat plate portion 12 a, for example, the sealing portion is configured to be thicker than other portions.

The sliding layer 41 is made of a resin material whose hardness is relatively higher (harder) than that of the sealing layer 42. Furthermore, the sliding layer 41 is made of a resin material that does not have adhesion or stickiness with the resin film layer of the cap body 11. That is, the sliding layer 41 is not bonded to the top plate portion 21 and slides on the top plate portion 21 in a state of being in contact with the top plate portion 21.

Examples of the resin material used for the sliding layer 41 include olefin-based resins such as polypropylene resins and polyethylene resins, polyester-based resins such as polyethylene terephthalate, styrene-based resins, and acrylic resins. In the present embodiment, the sliding layer 41 is made of, for example, polypropylene resin. A pigment, a lubricant, a softener, and the like can be appropriately added to the resin material used for the sliding layer 41.

The sliding layer 41 is provided separately from the cap body 11 so as to face the top plate portion 21 of the cap body 11. The sliding layer 41 is configured to be slidable with the top plate portion 21 of the cap body 11 by the resin material being used. The sliding layer 41 is configured in a disk shape. The outer diameter of the sliding layer 41 is smaller than the inner diameter of the skirt portion 22, smaller than the inscribed circle of the plurality of recessed portions 31, and larger than the smallest inner diameter of the bead portion 32.

The sliding layer 41 includes a first flat plate portion 41 a having a uniform thickness, a first curved surface portion 41 b whose outer surface of an outer peripheral edge on the top plate portion 21 side is formed by a curved surface, and a protruding portion 41 c provided on the sealing layer 42 side of the first curved surface portion 41 b. The first flat plate portion 41 a is configured in a manner such that the portion from the center of the sliding layer 41 to the outer peripheral side of the portion of the mouth portion 110 facing the curled portion 113 has a uniform thickness.

The first curved surface portion 41 b is configured in a manner such that the thickness of a portion from the outer peripheral side of a portion facing the curled portion 113 of the mouth portion 110 to the outer peripheral edge is made gradually thinner toward the outer peripheral edge. The protruding portion 41 c is configured in an annular protruding shape that is inclined with respect to the axial direction of the sliding layer 41 and the surface direction of the top plate portion 21 and is curved or inclined toward the opening end portion side of the skirt portion 22. The thickness of the protruding portion 41 c gradually decreases from the first curved surface 41 b toward the distal end.

The sealing layer 42 is made of a resin material whose hardness is relatively lower (softer) than that of the sliding layer 41. Examples of the resin material used for the sealing layer 42 include olefin-based resins, polyester-based resins, styrene-based resins, and acrylic resins, and more preferably include blended materials of a styrene-based elastomer and a polypropylene resin, blended materials of low-density polyethylene and a styrene-based elastomer, and polyester-based elastomers. In the present embodiment, the sealing layer 42 is made of, for example, a mixed material of a styrene-based elastomer and a polypropylene resin. A pigment, a lubricant, a softener, and the like can be appropriately added to the resin material used for the sealing layer 42.

The sealing layer 42 is integrally provided on the main surface of the sliding layer 41 on the side facing the mouth portion 110. The sealing layer 42 is formed in a disk shape. The outer diameter of the sealing layer 42 is configured to be larger than the outer diameter of the curled portion 113 of the mouth portion 110, and is configured to be substantially the same as the outer diameter of the sliding layer 41.

The sealing layer 42 includes a second flat plate portion 42 a whose portion facing the mouth portion 110 is thicker than other portions, a second curved surface portion 42 b whose outer surface of the outer peripheral edge on the top plate portion 21 side is a curved surface, and an annular recess 42 c provided on the main surface of the second curved surface portion 42 b on the side opposite to the sliding layer 41 side. The second flat plate portion 42 a has a flat main surface facing the curled portion 113. For example, the second flat plate portion. 42 a is configured to have the same diameter as the first flat plate portion 41 a of the sliding layer 41. The second flat plate portion 42 a configures the flat plate portion 12 a of the sealing member 12 together with the first flat plate portion 41 a.

The second curved surface portion 42 b has, for example, a main surface flush with a main surface of the second flat plate portion 42 a facing the curled portion 113. The second curved surface portion 42 b is configured in a manner such that the thickness of a portion from the outer peripheral side of a portion facing the curled portion 113 of the mouth portion 110 to the outer peripheral edge is made gradually thinner toward the outer peripheral edge. The second curved surface portion 42 b is stacked on the first curved surface portion 41 b and the protruding portion 41 c. The second curved surface portion 42 b configures the curved surface portion 12 b of the sealing member 12 together with the first curved surface portion 41 b and the protruding portion 41 c.

The recess 42 c is, for example, an annular recess having a semi-circular cross section. When the cap 1 is disposed in a state in which the top plate portion 21 faces upward and the sealing member 12 falls below the top plate portion 21, the sealing member 12 abuts against the bead portion 32 to be locked, and downward movement of the sealing member 12 in the gravity direction is restricted. Furthermore, when the cap 1 is removed from the can container 100, the sealing member 12 is supported by the bead portion 32, is separated from the mouth portion 110, and moves together with the cap body 11.

A method of manufacturing the cap 1 configured in the above manner will be briefly explained below. First of all, for example, the cap body 11 is molded in a cup shape from a metal plate material. The cap body 11 is then disposed on a lower mold in a posture in which the top plate portion 21 is positioned on a lower side in the gravity direction. A molten or softened resin material for the sliding layer 41 is then supplied onto the top plate portion 21, and the supplied resin material is compression-molded by an upper mold to mold the sliding layer 41. A molten or softened resin material for the sealing layer 42 is supplied onto the sliding layer 41, and the supplied resin material is compression-molded by the upper mold to mold the sealing layer 42 on the sliding layer 41. Subsequently, the recessed portion 31, the bead portion 32, the slit portion 33, the tamper evidence band portion 35, and the like are formed in the skirt portion 22 of the cap body 11. For example, the bead portion 32 is molded by pressing a molding tool whose distal end is curved against the outer surface of the skirt portion 22. The slit portion 33 is molded by disposing a molding tool having a cutting edge on the outer surface side and the inner surface side of the skirt portion 22 and sandwiching and shearing the molded bead portion 32 from the outer surface side and the inner surface side. The cap 1 is manufactured by such a process.

Furthermore, the manufactured cap 1 is set in a posture in which the top plate portion 21 of the cap 1 faces upward when the cap 1 is attached to the mouth portion 110 of the can container 100. Here, the sealing member 12 comes into contact with the inner surfaces of the plurality of recessed portions 31, thereby being positioned at the central portion of the cap body 11. When the sealing member 12 descends by a certain distance, the sealing member 12 is supported by the bead portion 32, and the movement thereof is restricted in the descending direction. When the cap 1 is placed on the mouth portion 110 in this state, a predetermined portion of the sealing layer 42 of the sealing member 12 faces the mouth portion 110 in this state, by roll-on molding the skirt portion 22 while drawing the corner portion 23 of the cap body 11, the cap 1 is wound and compacted on the mouth portion 110 of the can container 100.

According to the cap 1 configured in this manner, the bead portion 32 for restricting the movement of the sealing member 12 in the axial direction of the cap 1 is provided in the skirt portion 22, and the slit portion 33 for releasing the internal pressure of the can container 100 is provided in the bead portion 32. With this configuration, since the slit portion 33 is provided in the bead portion 32 recessed inward from the skirt portion 22 in an annular shape, the slit portion 33 is positioned inward in the radial direction from the outer peripheral surface of the skirt portion 22.

Therefore, when the cap 1 is operated to be opened, the slit portion 33 will not come into contact with a finger; therefore, the slit portion 33 will not cause a sense of discomfort by coming in contact with a hand. For this reason, even if the slit portion 33 is provided, the cap 1 can improve the tactile sensation when being opened.

In addition, since the distance from the slit portion 33 to the outer peripheral surface of the skirt portion 22 can be secured, when the internal pressure of the can container 100 is released, the contents can be suppressed from scattering together with the gas in the can container 100.

In addition, since the slit portion 33 is disposed on the distal end side of the skirt portion 22, that is, on the lower side in the posture of being attached to the can container 100 with respect the portion where the inner diameter of the bead portion 32 is the smallest, the skirt Portion 22 is positioned lower than the gap generated by separation of the sealing member 12 and the mouth portion 110 at the time of opening. Therefore, the distance in which the gas and the contents move becomes long, and the gas and the contents move downward from the inside of the can container 100 through the gap between the sealing member 12 and the mouth portion 110, and then flow into the atmosphere from the slit portion 33. Therefore, since it is possible to prevent the contents from moving to the slit portion 33 as much as possible, it is possible to further suppress the contents from scattering from the slit portion 33.

Furthermore, in the slit portion 33, the distal end of the first end portion 33 a is positioned further inward in the radial direction of the skirt portion 22 than the distal end of the second end portion 33 b. Therefore, as shown by the arrow in FIG. 4, the gas and the contents which have moved downward through the gaps between the sealing member 12 and the mouth portion 110 further move obliquely upward from between the distal end of the first end portion 33 a and the distal end of the second end portion 33 b. As a result, the movement of the contents is blocked by the first end portion 33 a of the slit portion 33, and the scattering of the contents from the slit portion 33 can be further suppressed.

In addition, since the end portion of the first end portion 33 a is configured to extend downward, the movement of the gas and the contents is changed from a downward movement to an upward movement at the first end portion 33 a as indicated by the arrow in FIG. 4, and thus the movement of the contents from the slit portion 33 can be further suppressed.

In other words, the configuration in which the distal end of the first end portion 33 a is positioned further inward in the radial direction of the skirt portion 22 than the distal end of the second end portion 33 b, and the configuration in which the distal end of the first end portion 33 a extends downward, cause the distal end of the first end portion 33 a to serve as a function for blocking liquid which is the contents moving together with the gas. Thus, the slit portion 33 has an effect of suppressing the contents from scattering.

In addition, the cap 1 is configured in a manner such that the plurality of recessed portions 31 are provided on the top plate portion 21 side with respect to the bead portion 32 of the skirt portion 22, whereby the sealing member 12 can be centered by the inner surfaces of the recessed portions 31. The plurality of recessed portions 31 improve the grip of the cap 1 when the cap 1 is opened, and prevent the upper portion of the cap 1 from shrinking due to molding of the bead portion during manufacturing.

As described above, according to the cap 1 according to an embodiment of the present invention, by providing the slit portion 33 in the bead portion 32, it is possible to improve the tactile sensation when opening the cap, and suppress the contents from scattering.

Note that the present invention is not limited to the above embodiment. For example, the slit portion 33 is not limited to the above configuration. In the example described above, the slit portion 33 may be provided only in the bead portion 32 recessed inward from the skirt portion 22 in an annular shape. The slit portion 33 having this configuration can also improve the tactile sensation of the cap 1 when the cap is opened, and suppress the contents from scattering. Similarly, the slit portion 33 may be configured in a manner such that the distal end of the first end portion 33 a is positioned at the same position as the distal end of the second end portion 33 b in the radial direction of the skirt portion 22 or positioned outward in the radial direction of the skirt portion 22 in addition, the slit portion 33 may have a shape in Which the distal end′ of the first end portion 33 a faces the same direction as other portions of the first end portion 33 a. However, in consideration of suppressing the contents from scattering, it is preferable that the slit portion 33 be located on the distal end side of the skirt portion 22 with respect to the portion where the inner diameter of the bead portion 32 is the smallest, the distal end of the first end portion 33 a extend in the axial direction, and the distal end of the first end portion 33 a be disposed radially inward with respect to the distal end of the second end portion 33 b.

It should be noted that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the invention in the implementation stage. In addition, the embodiments may be appropriately combined and implemented, and, in this case, exercise a combined effect. Furthermore, various inventions are included in the above embodiment, and various inventions can be extracted by a combination selected from a plurality of disclosed constituent elements. For example, even if some constituent elements are deleted from all the constituent elements shown in the embodiment, if the problem can be solved and the effect can be obtained, the configuration rom which the constituent elements are deleted can be extracted as the invention. 

1. A cap comprising: a cap body including a disk-shaped top plate portion and a cylindrical skirt portion provided at a peripheral edge portion of the top plate portion; a sealing member provided separately from the cap body in the cap body so as to face the top plate portion, the sealing member having an outer diameter smaller than an inner diameter of the skirt portion; a bead portion provided in the skirt portion, restricting movement of the sealing member in a direction away from the top plate portion, supporting the sealing member, and protruding annularly inward in a radial direction of the skirt portion; and a slit portion provided in the bead portion.
 2. The cap according to claim 1, wherein the slit portion is formed closer to a distal end side of the skirt portion than a portion of the bead portion having a smallest inner diameter.
 3. The cap according to claim 1, wherein the slit portion includes a first end portion on a side of the top plate portion and a second end portion on a distal end side of the skirt portion, and the first end portion is located inward in a radial direction of the skirt portion with respect to the second end portion.
 4. The cap according to claim 3, wherein a distal and of the first end portion extends in an axial direction of the skirt portion.
 5. The cap according to claim 1, comprising a plurality of recessed portions provided in the skirt portion on the top plate portion side with respect to the bead portion and provided in a circumferential direction. 